Testing knock sensor wiring

NOTE:

The knock sensor (KS) 1 -G61- and engine coolant temperature (ECT) sensor -G62- cannot be tested by themselves electrically.
Use only gold -plated terminals when repairing the cable connectors for the knock sensors.
To ensure that the knock sensors function properly it is important to keep to the specified tightening torque of 20 Nm.
Check connector between knock sensor and wiring harness for corrosion.

Disconnect connector of relevant knock sensor. See COMPONENT LOCATIONS, OVERVIEW .
Test for short between all three terminals in knock sensor connector (terminals 1+2, 1+3, 2+3).
- Specified value: INFINITY Ω (no continuity) - the wiring must not be connected to each other.

Fig 1: Identifying Knock Sensor 3-Pin Connector

G03612861

Courtesy of AUDI OF AMERICA, INC.

If there is a connection between terminals, install a new knock sensor.

If no malfunction is found: